Alright, resurrecting this thread a bit since my question is related to the earlier discussion on merino wool socks.

I picked up 5 new pair this week: 2 SmartWool PHDs (ultra lights), 2 Point6 ultra lites, and 1 pair of Point6 Lites (buy 2, get 1 free). They all have 2 things in common - merino wool and no care instructions at all.

Do you guys wash them in cold and line dry them? Or can you warm wash and/or toss them in the drier?